mirror of
https://github.com/torvalds/linux.git
synced 2026-01-25 07:47:50 +00:00
dba3ec9f2a
Pull irq updates from Thomas Gleixner: - Prevent a interrupt migration related live lock in handle_edge_irq() If the interrupt affinity is moved to a new target CPU and the interrupt is currently handled on the previous target CPU for edge type interrupts the handler might get stuck on the previous target for a long time, which causes both involved CPUs to waste cycles and eventually run into a soft-lockup situation. Solve this by checking whether the interrupt is redirected to a new target CPU and if the interrupt is handled on that new target CPU, busy wait for completion instead of masking it and sending the pending but which would cause the old CPU to re-run the handler and in the worst case repeating this excercise for a long time. This only works on architectures which use single CPU interrupt targets, but that's so far the only ones where this behaviour has been observed. - Add a kunit test for interrupt disable depth counts The nested interrupt disable depth has been an issue in the past especially vs. free_irq(), interrupt shutdown and CPU hotplug and their interactions. The test exercises the combinations of these scenarios and checks for correctness. * tag 'irq-core-2025-07-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: genirq: Prevent migration live lock in handle_edge_irq() genirq: Split up irq_pm_check_wakeup() genirq: Move irq_wait_for_poll() to call site genirq: Remove pointless local variable genirq: Add kunit tests for depth counts
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.